i have a few vegetarian friends and a couple of very close vegan friends.

one of them is a girl who is a raw vegan (a more hardcore version of veganism) and i can safely say her diet is healthier than the vast majority of the population. she puts a lot of dedication on it, though.

Humans are also supposed to be more intelligent than other animals and we are also supposed to have develop some form of a conscience, so it makes sense that some of us choose not to eat meat because of moral objections to eating animals, among other reasons.